00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022 #include <strings.h>
00023 #include <float.h>
00024
00025 #include "avformat.h"
00026 #include "internal.h"
00027
00028 #include "libavutil/log.h"
00029 #include "libavutil/opt.h"
00030 #include "libavutil/avstring.h"
00031 #include "libavutil/parseutils.h"
00032 #include "libavutil/mathematics.h"
00033
00034 typedef struct {
00035 const AVClass *class;
00036 int number;
00037 AVFormatContext *avf;
00038 char *format;
00039 char *list;
00040 float time;
00041 int size;
00042 int64_t offset_time;
00043 int64_t recording_time;
00044 int has_video;
00045 AVIOContext *pb;
00046 } SegmentContext;
00047
00048 static int segment_start(AVFormatContext *s)
00049 {
00050 SegmentContext *c = s->priv_data;
00051 AVFormatContext *oc = c->avf;
00052 int err = 0;
00053
00054 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
00055 s->filename, c->number++) < 0)
00056 return AVERROR(EINVAL);
00057
00058 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
00059 &s->interrupt_callback, NULL)) < 0)
00060 return err;
00061
00062 if (!oc->priv_data && oc->oformat->priv_data_size > 0) {
00063 oc->priv_data = av_mallocz(oc->oformat->priv_data_size);
00064 if (!oc->priv_data) {
00065 avio_close(oc->pb);
00066 return AVERROR(ENOMEM);
00067 }
00068 if (oc->oformat->priv_class) {
00069 *(const AVClass**)oc->priv_data = oc->oformat->priv_class;
00070 av_opt_set_defaults(oc->priv_data);
00071 }
00072 }
00073
00074 if ((err = oc->oformat->write_header(oc)) < 0) {
00075 goto fail;
00076 }
00077
00078 return 0;
00079
00080 fail:
00081 avio_close(oc->pb);
00082 av_freep(&oc->priv_data);
00083
00084 return err;
00085 }
00086
00087 static int segment_end(AVFormatContext *oc)
00088 {
00089 int ret = 0;
00090
00091 if (oc->oformat->write_trailer)
00092 ret = oc->oformat->write_trailer(oc);
00093
00094 avio_close(oc->pb);
00095 if (oc->oformat->priv_class)
00096 av_opt_free(oc->priv_data);
00097 av_freep(&oc->priv_data);
00098
00099 return ret;
00100 }
00101
00102 static int seg_write_header(AVFormatContext *s)
00103 {
00104 SegmentContext *seg = s->priv_data;
00105 AVFormatContext *oc;
00106 int ret, i;
00107
00108 seg->number = 0;
00109 seg->offset_time = 0;
00110 seg->recording_time = seg->time * 1000000;
00111
00112 if (seg->list)
00113 if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
00114 &s->interrupt_callback, NULL)) < 0)
00115 return ret;
00116
00117 for (i = 0; i< s->nb_streams; i++)
00118 seg->has_video +=
00119 (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);
00120
00121 if (seg->has_video > 1)
00122 av_log(s, AV_LOG_WARNING,
00123 "More than a single video stream present, "
00124 "expect issues decoding it.\n");
00125
00126 oc = avformat_alloc_context();
00127
00128 if (!oc) {
00129 ret = AVERROR(ENOMEM);
00130 goto fail;
00131 }
00132
00133 oc->oformat = av_guess_format(seg->format, s->filename, NULL);
00134
00135 if (!oc->oformat) {
00136 ret = AVERROR_MUXER_NOT_FOUND;
00137 goto fail;
00138 }
00139 if (oc->oformat->flags & AVFMT_NOFILE) {
00140 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
00141 oc->oformat->name);
00142 ret = AVERROR(EINVAL);
00143 goto fail;
00144 }
00145
00146 seg->avf = oc;
00147
00148 oc->streams = s->streams;
00149 oc->nb_streams = s->nb_streams;
00150
00151 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
00152 s->filename, seg->number++) < 0) {
00153 ret = AVERROR(EINVAL);
00154 goto fail;
00155 }
00156
00157 if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
00158 &s->interrupt_callback, NULL)) < 0)
00159 goto fail;
00160
00161 if ((ret = avformat_write_header(oc, NULL)) < 0) {
00162 avio_close(oc->pb);
00163 goto fail;
00164 }
00165
00166 if (seg->list) {
00167 avio_printf(seg->pb, "%s\n", oc->filename);
00168 avio_flush(seg->pb);
00169 }
00170
00171 fail:
00172 if (ret) {
00173 oc->streams = NULL;
00174 oc->nb_streams = 0;
00175 if (seg->list)
00176 avio_close(seg->pb);
00177 avformat_free_context(oc);
00178 }
00179 return ret;
00180 }
00181
00182 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
00183 {
00184 SegmentContext *seg = s->priv_data;
00185 AVFormatContext *oc = seg->avf;
00186 AVStream *st = oc->streams[pkt->stream_index];
00187 int64_t end_pts = seg->recording_time * seg->number;
00188 int ret;
00189
00190 if ((seg->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
00191 av_compare_ts(pkt->pts, st->time_base,
00192 end_pts, AV_TIME_BASE_Q) >= 0 &&
00193 pkt->flags & AV_PKT_FLAG_KEY) {
00194
00195 av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n",
00196 pkt->stream_index, pkt->pts);
00197
00198 ret = segment_end(oc);
00199
00200 if (!ret)
00201 ret = segment_start(s);
00202
00203 if (ret)
00204 goto fail;
00205
00206 if (seg->list) {
00207 avio_printf(seg->pb, "%s\n", oc->filename);
00208 avio_flush(seg->pb);
00209 if (seg->size && !(seg->number % seg->size)) {
00210 avio_close(seg->pb);
00211 if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
00212 &s->interrupt_callback, NULL)) < 0)
00213 goto fail;
00214
00215 }
00216 }
00217 }
00218
00219 ret = oc->oformat->write_packet(oc, pkt);
00220
00221 fail:
00222 if (ret < 0) {
00223 oc->streams = NULL;
00224 oc->nb_streams = 0;
00225 if (seg->list)
00226 avio_close(seg->pb);
00227 avformat_free_context(oc);
00228 }
00229
00230 return ret;
00231 }
00232
00233 static int seg_write_trailer(struct AVFormatContext *s)
00234 {
00235 SegmentContext *seg = s->priv_data;
00236 AVFormatContext *oc = seg->avf;
00237 int ret = segment_end(oc);
00238 if (seg->list)
00239 avio_close(seg->pb);
00240 oc->streams = NULL;
00241 oc->nb_streams = 0;
00242 avformat_free_context(oc);
00243 return ret;
00244 }
00245
00246 #define OFFSET(x) offsetof(SegmentContext, x)
00247 #define E AV_OPT_FLAG_ENCODING_PARAM
00248 static const AVOption options[] = {
00249 { "segment_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
00250 { "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E },
00251 { "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
00252 { "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.dbl = 5}, 0, INT_MAX, E },
00253 { NULL },
00254 };
00255
00256 static const AVClass seg_class = {
00257 .class_name = "segment muxer",
00258 .item_name = av_default_item_name,
00259 .option = options,
00260 .version = LIBAVUTIL_VERSION_INT,
00261 };
00262
00263
00264 AVOutputFormat ff_segment_muxer = {
00265 .name = "segment",
00266 .long_name = NULL_IF_CONFIG_SMALL("segment muxer"),
00267 .priv_data_size = sizeof(SegmentContext),
00268 .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
00269 .write_header = seg_write_header,
00270 .write_packet = seg_write_packet,
00271 .write_trailer = seg_write_trailer,
00272 .priv_class = &seg_class,
00273 };
